Heinrich witzenmanisr



No. 542,300- 'Y Patented July 9, 1895,

Afro/wen I 'UNITED STATES PATENT risica;

HEINRICH WITZENMANN, QF PFORZHEIM, GERMANY.

FLExiBLE Tues or METAL,

SPECIFICATION formingpart of Letters Patent No. 542,300, dateduly 9, 1895.

Application filed February 20, 1894. Serial ITO. 500,876. (No mqdeij 2, 1894, No. 76,745; c in .'E'rance'febrnerynl 2, 1894, No. 236.225 i'ii Austria February 27, in Hungary March 5, 1894,170. 189; in Italy May 1U, 1894, No. 35,359/214, and in Switzerland May 21, 1894, No. 8,588.

but preference is 'iven to a section by which To all whom t mayeoncerm the edge of one coil e tknown that I, HEINRICH WITZENMANN, a subject of the Emperor of Germany, resid- Germany, have invented useful Improvements in Flexible Metal Tubes, (for which I obtained Germany February 2, 189i, No. 76,745,- in Italy May l0, 1894, No.

36,359/214; in Switzerland. May 2l, 189i, ings that the lower edge of'the metal stri No. 8,538, in Francey February 12, 1894,v No. composing the outer spiral is bent outwardly 236,225; in Austria February 27, 1894, No. i and back upon itself, and the upper edge of 44/547, and in Hungary March 5 189i No. saidrstrip is bent inwaidly/and back upon 169,) of which the following isaspeciiication itself so that the respective edges overlap The obge'ctoi'l my invention is to provide a considerably in order to allow for extension flexible metal tube capableof beinfT bentand and contraction ofthe several or all the coilsl twisted in any direction without liability to comprising the spiral when the tube is bent.

is the inirei'spi'ral andrisrwonnd inan op' posite directionto that of the outer spiral a, and this spiral b Viiiay also be formed of a metal band of any required cross-section. Good results have, however, been obtained by a metal strip of a cross-section, as shown in be caused and adapted to con- .to perinit tube.

If desired, the channels may be made wide enough to permit the laying of a packing c My inventionwill be more fully understood taken in connection with the accompanying drawings, i'n which` igiire l is alongitudiual section of myimproved dexible met'a'l tube, showing the inner and an of channeled metal packing' maybe materials suitable for the purpose for which the flexible tube is intended. For instance, rubber, asbestos, oi' a lead or other packing,

outer spirals;

and Fig. 3 is the improved tube.

Referring now to the drawingsfor a furtherA description spiral woun a band of metal of any a cross-section of into the spiral spaceb, formed by the lowerA ieek in the miie, eine epeeiieenf oppoeiely-wonni 'ine 5' sgireieffi :m- .re soliieref er in any einer meneer 'nsienerl tegeilier` The feisening et rile respeeiive enfle ei ine irre spirnie n :m if? eoi'nprisieg -i'ionele fieiibie inbegre- 'renis ine nneeiiing ei ene er iiie eiherspirnl/ when Lire mbe, *aerien Y. in @neer the' einer" (iireeiien-n '"{f'g for insiemei lie inne ie twisiex .in ene lire/@liens ene of te epirais `Will ne .strf ed if nneeii, zrl'iiie ihr; einer will ne ed ieleyire -eiis tigii'er; lont; ne einr-4 "iing ei e rbily-weizns egiirel is linek eviiie'n't limi tne 'i of die I nirni if@ die leek siieneingthe niil ie else iiinitefl Snell ieniwej'e reigeired er the ine'eenie by the animi weee-e eeiie er miei-ine; ei iiie mbe.

L wiii be nndersieel tiene 'rneiiiieetione iney 'ne merle in the eenetineiien ef ne iene. Fer inerente? iheereee 'eeien of eiinerene e5 iiie spirale, or linie, n be eiere., end me peeinvingerips ei" any inet-@rmi be dispensed wither giren ai epeeei yeresie-eemien witiiont `Vieperting freni' *eine o my inveniien.

gering inne {ieeerineil iie nature endV obees 'ei .m3 in. neninn7 *erlie i. claim desire ie seenre by Leiers isetent,

il; in" tened by ille en inner in 'ie envie-rising en inneren eeen eernpoeed. oi e spirelly lievi r` mi egee, 'aile miie e ned in one reepeeiive sei; fort-h.

3. A flexible tne eomprieing two spirals one .Within the ether and fastened together at their respeeive ends, each spirai formed ei e eentinuons nieta! band, the inner spiral beingwoun in ene ireotion and the outer spiral in en oppoeite direction and apacking svnbsientinily as and for -tlxe forth. v y

A iiexinle tube comprising two spirals purposes set;

their respeeiive ends, il1e inner spiral formed of e. eoninnouemeel band 'havingn crosseeoiion '0E eine being wound in one direction, spiral formed eiso ef aeontin disposed channels 'die oner fianges of which are beni so that they interlock one iyith V:inotiaer when eoiie, seid enter spiral being wound in en opposite ireetion'to tha'of the inner spiraal, substantially as and for the pur'- peses net orth 5. exible tube oo one Within ine other and fastene their respective ends, the seid spire 's formed ef oiienne'ied continuous metalV bands, one spiral being wound in one-direction nn'djxthe other in en opposite dir'eefien, substantially es enti for the purpnses set fertili, l

6. A flexible tribe eomprisingftwe spirals 'ene Whin @lie nip'i-isi'ng @We 'spirals etal bends, the npof the spiralsi'm- BENEDIGTGOLUFINGER..

'ende'snbsteniinily ne and for the purposes strip nppiied te the coils of the inner spiral,

one within neebiier and fastened ,togeiher at two inverselydisposed channels,4 i

the outer; nous-metal bandi` Whose eress-seeiien eine forms two vinverselydtvo etherat.

other andv fastened together at,v their reepeeive ende, ille said spirals formed er channeled portion` 

